wal·lop (wŏləp) Informal
v. wal·loped, wal·lop·ing, wal·lops
1. To beat forcefully; thrash.
2. To strike with a hard blow: walloped the ball into the outfield.
3. To defeat thoroughly.
4. To affect harshly or severely: was walloped with a large fine.
To move in a heavy or clumsy manner.
1. A hard or severe blow.
a. A powerful force: has a punch that delivers a wallop.
b. A powerful effect: "Therein lies the novel's emotional wallop and moral message" (George F. Will).
[Middle English walopen, to gallop, from Old North French *waloper; see wel-1 in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.